一般说来,耕作土壤在作物生长期间的氮素供应状况是影响产量的最活泼因素之一。在土壤肥力不高、氮肥供应不足的情况下,增加氮肥用量,作物产量也随之相应的增加。过去关于氮肥施用效果的研究多偏重于施肥量与增产的关系,或不同土壤上施用氮肥的效果,在这方面长期以来集中了不少农业化学工作者的注意力。在研究方法方面,除了大量的田间及盆栽试验外,常用的是室内培养法,即测定土壤氮素供应能力或可矿化氮量。Harmsen和Schreven曾指出,室内培养法所测得的结果与氮肥的增产效果之间的相关 In general, the status of nitrogen supply during cultivation of cultivated soils during crop growth is one of the most active factors affecting production. In the case of low soil fertility and insufficient supply of nitrogen fertilizer, the amount of nitrogen fertilizer increased and the crop yield also increased correspondingly. In the past, much attention was paid to the effects of nitrogenous fertilizer application on the relationship between the amount of fertilizer application and yield increase or the effect of applying nitrogenous fertilizer on different soils. In this regard, the attention of many agrochemical workers has long been concentrated. In terms of research methods, in addition to a large number of field and pot experiments, commonly used indoor culture method, that is, to determine soil nitrogen supply capacity or mineralizable nitrogen. Harmsen and Schreven have pointed out that the correlation between the results measured by the in-house culture method and the stimulation effect of nitrogen fertilizer